Issue |
MATEC Web Conf.
Volume 403, 2024
SUBLime Conference 2024 – Towards the Next Generation of Sustainable Masonry Systems: Mortars, Renders, Plasters and Other Challenges
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Article Number | 02002 | |
Number of page(s) | 8 | |
Section | Mortar Properties | |
DOI | https://doi.org/10.1051/matecconf/202440302002 | |
Published online | 16 September 2024 |
Does lack of CO2 control in environmental chambers influence the strength and stiffness of hydraulic lime mortars?
University of Oxford, Department of Engineering Science, OX1 3PJ Oxford, United Kingdom
* Corresponding author: miles.judd@eng.ox.ac.uk
This study investigates the influence of carbon dioxide (CO2) control in environmental chambers, where hydraulic lime mortar specimens are typically cured before strength testing according to EN1015-11:2019. To do this, three sets of identical mortar samples were cast. Two sets were cured in an environmental chamber that offered the same temperature and relative humidity but different CO2 conditions. In the first chamber, carbonation reactions used the ambient CO2 trapped in the hermetically sealed chamber air. The second chamber was connected to an external carbon dioxide supply, which maintained a constant CO2 concentration, above ambient laboratory levels, during curing. A third set of samples was cured under laboratory conditions to serve as a reference. Following the 35-day curing period, the dynamic elastic modulus and flexural and compressive strengths of sample sets were obtained. Subsequent X-ray diffraction analysis gives additional insights into the material composition for each curing regime. Results indicate that controlling carbon dioxide to above ambient levels leads to noticeably higher stiffness and strength in samples. This suggests that implementing CO2 control as a part of standard curing conditions may enable more reliable estimates of strength and stiffness development in lime mortars, with respect to laboratory conditions.
© The Authors, published by EDP Sciences, 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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